gateway

A gateway is a network node that connects two networks using different protocols together. While a bridge is used to join two similar types of networks, a gateway is used to join two dissimilar networks.

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The most common gateway is a router that connects a home or enterprise network to the internet. In most IP-based networks, the only traffic that doesn't go through at least one gateway is traffic flowing among nodes on the same local area network (LAN) segment -- for example, computers connected to the same switch.

Gateways can take several forms and perform a variety of tasks. These include:

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If we will be able to get the device signature consisting of one of the parameter as gateway address then definitely we will be able to detect the node which is acting as malicious........ hope will help :)